Android 自带语音识别功能
在Android 1.5 SDK中已经加强了语音识别功能,第三方通过Intent就可以简单的使用这个功能!下面做简要说明!
先看页面布局:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:padding="5dip"> <Button android:id="@+id/button1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="语音识别" /> <ListView android:id="@+id/listView1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#00000000"> </ListView> </LinearLayout>
说明:LinearLayout里面垂直放置了Button和ListView,通过Button的点击事件触发语音识别,然后把结果设置到ListView中。
Activity中的代码如下:
import java.util.ArrayList; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.speech.RecognizerIntent; import android.view.View; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.Toast; import android.widget.AdapterView.OnItemClickListener; public class RecognizerActivity extends Activity implements OnClickListener, OnItemClickListener { private static final int VOICE_RECOGNITION_REQUEST_CODE = 131422; private ListView mListView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mListView = (ListView) findViewById(R.id.listView1); mListView.setOnItemClickListener(this); ((Button) findViewById(R.id.button1)).setOnClickListener(this); } @Override public void onClick(View v) { mListView.setAdapter(null); try { Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH); intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM); intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "开始语音识别"); startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE); } catch (Exception e) { e.printStackTrace(); Toast.makeText(this, "不能语音识别", Toast.LENGTH_SHORT).show(); } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && data != null) { ArrayList<String> results = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS); if (results != null) { mListView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, results)); Toast.makeText(this, results.toString(), Toast.LENGTH_SHORT).show(); super.onActivityResult(requestCode, resultCode, data); } } } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(this, parent.getAdapter().getItem(position).toString(), Toast.LENGTH_SHORT).show(); } }
说明:
- onCreate:获得相关View的引用,并设置对应的事件处理;
- onClick:清空ListView数据,并启动语音识别,如果系统没有Activity处理请求的Intent,以Toast形式提示;
- onActivityResult:获得语音识别后的结果并做相关处理;
- onItemClick:ListView中数据项点击事件处理------显示;
运行效果如图:
多说一句:当然还有其它方法实现语音识别,但此方法比较简单!:)
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